/usr/share/groff/1.22.2/font/devps/generate/symbolchars is in groff-base 1.22.2-8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | #
# Additional predefined groff symbols for special fonts.
#
arrowdown arrowvertbt
arrowup arrowverttp
divide di
equal eq
logicalnot no
minus mi
multiply mu
plusminus +-
plus pl
Upsilon1 *U
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